Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7c57fbd66d3070…

MALICIOUS

PDF

40.1 KB Created: 2020-11-02 23:35:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fbe712b1f3c3ed0f5cfe7130848c2b9 SHA-1: 5d761653a8e6e11a16573c6d77d7d7913cb77617 SHA-256: cd7c57fbd66d3070550d9c525773b26119d4f3ea08df68a08cd4835c12665a20
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains numerous embedded links, including one pointing to a known malicious redirector. The document body is heavily obfuscated but contains keywords suggesting a lure for software downloads. The presence of a malicious redirector and a link farm indicates an attempt to drive traffic to potentially harmful sites, likely for further exploitation or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/123?keyword=fortnite+apk+download+kindle+fire+7+hd
    • https://tovisasuwuvep.weebly.com/uploads/1/3/4/5/134513775/6859220.pdf
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/2441207.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0ff3ac48-e4ef-43fd-95d6-a07b2433a676/55181885000.pdf
    • https://s3.amazonaws.com/kitakilesa/17659232960.pdf
    • https://s3.amazonaws.com/memul/62804294800.pdf
    • https://uploads.strikinglycdn.com/files/7278942c-125f-4667-a511-e877924bbd8e/sisuzupozixilibaweka.pdf
    • https://uploads.strikinglycdn.com/files/d34324d5-0b03-4a1d-b272-4b4a53dec73c/words_of_wisdom_for_police_officers.pdf
    • https://uploads.strikinglycdn.com/files/5ec13b94-3033-4bfc-a758-568795ba1d6f/98961497611.pdf
    • https://s3.amazonaws.com/fekaduvopigab/buzasala.pdf
    • https://uploads.strikinglycdn.com/files/b98cc870-470d-4628-8b0c-af98c894461f/tekavufivudokedaderixumo.pdf
    • https://s3.amazonaws.com/tetazino/41112144638.pdf
    • https://uploads.strikinglycdn.com/files/dd0a16e5-827d-4c65-9633-dcfcbb607f12/statement_of_research_interests_sample_for_graduate_school.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d79.bin
2e87198763933276a72e5f7e7fca09affaad708a4f821cfe383f1448eca84ed5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D79 5144 bytes
font_01_sfnt_off00006f16.bin
68fc09f54e96ac8784985778143fad686263869091b7ad31bb09bea89fea98b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F16 10716 bytes